Acicular ferromagnetic iron oxide particles and process for prod

Details Acicular ferromagnetic iron oxide particles and process for prod Acicular ferromagnetic iron oxide particles and process for prod

1994-06-07

1996-04-30

Bonner, C. Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6262, 423632, C01G 4902

Patent

active

055121942

ABSTRACT:
There are provided acicular berthollide particles comprising crystalline particles expressed by the formula FeOx (1.33.ltoreq.x<1.5) and modified with a specific amount of zinc ions and a process producing the same which comprises the steps of oxidizing acicular magnetic iron oxide particles expressed by the formula FeOx (1.0<x<1.33) and modified with a specific amount of zinc ions which are produced by (a) heating and dehydrating acicular hydrous iron oxide particles containing a specific amount of a zinc component, reducing, and heating the particles under specific conditions, or (b) reducing acicular iron oxide particles containing a specific amount of a zinc component and heating the particles under specific conditions, or (c) heating acicular magnetic iron oxide particles expressed by the formula FeOx (1.0<x<1.33) containing a specific amount of zinc ions under specific conditions.

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patent: 4311684 (1982-01-01), Umeki
patent: 4367214 (1983-01-01), Sarnecki et al.
patent: 5041307 (1991-08-01), Koyama et al.

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